As Allan says, 4/3 sensor and upwards according to Alamy guidelines though many swear by careful use of the Sony RX100 series (1" sensor), though mostly, but not exclusively they also use larger sensor cameras. Plenty on here about that.

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Does anyone know if images taken with the Sony RX100 are still being accepted?

Absolutely they are. IMHO the images I get from my Sony RX100 Mk III with 1" sensor have better IQ than my Lumix G& which has a Micro 4/3 sensor. Another factor that Alamy don't mention is the design of the sensor and micro-lens assembly. In general back side illuminated sensors (BSI) are better than front side as the sensor interconnections don't obscure the sensor elements. The micro-lens assembly is also important in focusing light onto each sensing element. As Alamy say, their guide is only a "rough guide". Another critical factor is how many pixels the sensor has. Too many pixels crammed into a small sensor will give more noise problems than a lower pixel count sensor of the same size.

Absolutely they are. IMHO the images I get from my Sony RX100 Mk III with 1" sensor have better IQ than my Lumix G& which has a Micro 4/3 sensor. Another factor that Alamy don't mention is the design of the sensor and micro-lens assembly. In general back side illuminated sensors (BSI) are better than front side as the sensor interconnections don't obscure the sensor elements. The micro-lens assembly is also important in focusing light onto each sensing element. As Alamy say, their guide is only a "rough guide". Another critical factor is how many pixels the sensor has. Too many pixels crammed into a small sensor will give more noise problems than a lower pixel count sensor of the same size.

Not really relevant but I just did the maths and was surprised to see that if you were able to scale up the RX100 sensor to full frame you'd be getting over 140 Mp.

I see the new Sony sensor gives 9504 x 6336 pixels, way more than I've ever wanted but I guess there will be those who will find a use for it. Sony themselves promote the ability to crop dramatically and still leave a decent file size, for bird photographers etc. There are also more AF points, better dynamic range, better viewfinder etc.

I suppose another question is how else are manufacturers going to keep persuading people to buy new cameras every year or so if it's not by increasing the pixel count.

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Anyone know where I can find the list of cameras Alamy wont accept images from?

Abandoning the compact camera route, I am photographing small copper coins ca 15cm dia and non of the cameras allow me to fill the frame with such a small object so... back to the SLR with extension tubes I guess.